The P0319 OBD-II trouble code means the powertrain control module has detected a problem with its designated Rough Road Sensor “B” signal.

The generic definition is:

P0319 — Rough Road Sensor “B” Signal Circuit

Sensor B is a manufacturer-defined input. Depending on the vehicle, it may represent:

A second chassis accelerometer
A vertical acceleration sensor
One channel of a multi-axis sensor
Data calculated by the ABS module
Wheel-speed information assigned to a secondary channel
A network message from a chassis-control module

P0319 does not automatically identify the right-side wheel-speed sensor. It also does not prove that the engine has an actual combustion misfire.

The code means the PCM considers the Sensor B signal missing, implausible, intermittent or outside its expected range.

P0319 belongs to the powertrain-code family covered in the complete Pro Street P-code OBD-II guide.

P0319 Quick Answer

Item	Information
Trouble code	P0319
Definition	Rough Road Sensor “B” Signal Circuit
System	Rough-road detection and misfire validation
Severity	Moderate
Safe to drive?	Usually briefly, unless braking, stability-control or severe engine problems are present
Common causes	Sensor B fault, circuit damage, ABS data loss, communication or configuration problem
First diagnostic step	Identify Sensor B using factory service information
Related codes	P0317, P0318, ABS wheel-speed codes and communication U-codes
Typical repair range	Approximately $100 to $1,500+, depending on the cause

What Does P0319 Mean?

The PCM detects many combustion misfires by monitoring small changes in crankshaft speed.

A healthy cylinder accelerates the crankshaft during its power stroke. A weak or missing combustion event causes a measurable decrease in crankshaft acceleration.

Driving over potholes, gravel, railroad crossings or another uneven surface can also disturb crankshaft speed through the wheels, transmission and drivetrain.

Rough-road information helps the PCM determine whether a crankshaft-speed change came from:

Actual combustion failure
Wheel hop
Wheel slip
Chassis movement
Uneven pavement
ABS intervention
Stability-control operation

When the PCM detects a fault involving its designated Sensor B input, it may store P0319.

Possible fault conditions include:

Missing Sensor B signal
Signal stuck high
Signal stuck low
Implausible sensor response
Intermittent signal dropout
Signal that disagrees with Sensor A
Open circuit
Short to ground
Short to voltage
Missing network message
Incorrect module configuration

The exact code-setting criteria vary by manufacturer.

What Is Rough Road Sensor B?

“Sensor B” is a diagnostic designation rather than a universal component location.

It does not necessarily mean:

Right-front wheel-speed sensor
Right-rear wheel-speed sensor
Passenger-side accelerometer
Second physical sensor
Sensor mounted on Bank 2

Depending on the application, Sensor B may be:

A Second Physical Accelerometer

Some systems use more than one chassis or suspension acceleration sensor. Sensor B may monitor movement at a different vehicle location.

A Second Axis of One Sensor

A multi-axis sensor may measure movement in several directions. The PCM or chassis module may designate one calculated channel as Sensor A and another as Sensor B.

An ABS-Calculated Value

The ABS module may combine several wheel-speed signals and transmit more than one rough-road status or calculation.

A Network Message

Sensor B may exist only as data sent from:

ABS module
Electronic Brake Control Module
Stability-control module
Chassis-control module
Suspension-control module

This is why P0319 diagnosis must begin with manufacturer-specific service information.

Looking for a physical component labeled “B” is not a diagnostic strategy. It is how perfectly innocent sensors end up being unplugged for questioning.

Why Does the PCM Need Sensor B?

The PCM must avoid confusing road-induced drivetrain movement with engine misfires.

Sensor B may provide:

Redundant rough-road information
Movement data from another part of the chassis
A second acceleration axis
Another wheel-speed comparison
Plausibility confirmation for Sensor A
Backup data when one source becomes unreliable

The PCM or chassis module may compare Sensor A and Sensor B to determine whether:

Both sensors agree that the road is uneven
Only one sensor shows movement
One signal is physically implausible
A sensor is stuck
A circuit has become intermittent
A module is transmitting incorrect information

A Sensor B fault can reduce the system’s ability to validate crankshaft variation and misfire data accurately.

P0319 Versus P0318

P0318 and P0319 describe separate rough-road signal assignments.

Code	Meaning
P0318	Rough Road Sensor A Signal Circuit
P0319	Rough Road Sensor B Signal Circuit

The diagnostic distinction is important.

If only P0319 is stored:

Sensor B itself may have failed.
Its dedicated signal circuit may be open or shorted.
Sensor B may be mounted incorrectly.
Its network message may be missing.
Sensor B calibration may be incomplete.

If P0318 and P0319 appear together:

Shared power may be missing.
Shared ground may have excessive resistance.
A supplying module may be offline.
The communication network may have failed.
Module configuration may be incorrect.
Both sensors may require initialization.

Two codes appearing together should shift attention from isolated Sensor B replacement toward shared circuits and modules.

P0319 Versus P0317

P0317 indicates that the expected rough-road hardware or information is unavailable.

P0319 identifies a more specific problem with Sensor B’s signal.

Code	Diagnostic focus
P0317	Rough-road hardware, configuration or data source unavailable
P0319	Sensor B signal invalid, missing or implausible

If both codes are stored, inspect:

Sensor B availability
Supplying module
Controller configuration
Sensor initialization
Network communication
Shared power and grounds

Do not assume Sensor B is defective until the PCM has been confirmed to expect that signal on the vehicle.

P0319 Versus an ABS Wheel-Speed Code

P0319 does not necessarily identify a failed wheel-speed sensor.

Code group	General intent
P0319	Rough Road Sensor B signal used by the PCM
C0035–C0051	Individual wheel-speed sensor or circuit fault
U-codes	Lost or invalid module communication

A wheel-speed sensor may contribute to Sensor B data, but the connection must be confirmed through:

Factory wiring diagrams
ABS live data
Manufacturer signal descriptions
Module communication information
Related chassis codes

For individual chassis and wheel-speed faults, visit the complete C-code OBD-II library.

Common Conditions Associated With P0319

A vehicle with P0319 may experience:

Check Engine Light
ABS warning light
Traction-control warning
Stability-control warning
Failed emissions inspection
Disabled or limited misfire validation
False or inconsistent misfire codes
Intermittent warnings over rough roads
Cruise-control problems on some applications
Suspension-control warning on applicable vehicles
No noticeable drivability problem

P0319 itself usually does not cause a rough idle or loss of engine power.

If the engine runs poorly, diagnose the combustion problem separately.

How Serious Is P0319?

P0319 is generally moderate in severity.

The engine may continue running normally because the fault usually affects rough-road and misfire validation rather than direct fuel or ignition control.

However, P0319 should be diagnosed because the underlying problem may involve:

ABS wheel-speed information
Stability-control data
Chassis accelerometer operation
Module communication
Incorrect controller programming
Wiring damage
Inaccurate misfire detection

Stop Driving or Seek Immediate Service If:

The red brake warning and ABS light appear together
Braking behavior changes
Stability-control operation becomes unpredictable
Multiple wheel-speed signals disappear
Suspension-control faults affect vehicle handling
The Check Engine Light flashes
Severe engine shaking or power loss occurs
Several control modules stop communicating

P0319 alone does not prove that ABS or stability control is disabled. Check those modules for their own stored codes and status.

Most Common Causes of P0319

Possible cause	Relative likelihood
Damaged Sensor B wiring or connector	High
Faulty dedicated Sensor B	High where equipped
Missing ABS-derived Sensor B data	High on calculated systems
Sensor B mounted incorrectly	Medium after repair
Sensor A/B calibration incomplete	Application dependent
Shared power or ground fault	High when P0318 is also stored
CAN communication problem	Medium
Incorrect PCM or chassis-module configuration	Medium after module replacement
Damaged wheel-speed tone ring or encoder	Medium on ABS-derived systems
Low battery voltage or poor ground	Medium
ABS or chassis-control module fault	Lower
PCM failure	Rare

The correct diagnostic path depends on the vehicle’s definition of Sensor B.

How to Diagnose P0319

Step 1: Scan Every Control Module

Use a professional scan tool capable of accessing:

PCM or ECM
ABS module
Electronic Brake Control Module
Stability-control module
Chassis-control module
Suspension-control module
Body Control Module where applicable

Record:

Stored codes
Pending codes
Permanent codes
Freeze-frame data
Manufacturer-specific codes
Module communication status
Sensor A and Sensor B live data

Do not clear the codes yet.

A basic engine-code reader may retrieve P0319 but miss the chassis code that identifies the failed signal source.

Step 2: Determine Whether P0319 Is Isolated

Check whether the vehicle also stores:

P0317
P0318
Wheel-speed sensor codes
Accelerometer codes
Lost-communication codes
Low-voltage codes
Module-configuration faults
Misfire codes

The code pattern provides important direction.

Code pattern	Likely diagnostic direction
P0319 only	Concentrate on Sensor B and its dedicated signal path
P0318 plus P0319	Inspect shared power, ground, module and communication
P0317 plus P0319	Verify that Sensor B hardware is installed and configured
P0319 plus wheel-speed code	Diagnose the corresponding ABS signal first
P0319 plus lost-module code	Test communication, power and grounds
P0319 after module replacement	Verify programming and configuration
P0319 plus low-voltage codes	Test battery, alternator, power and grounds

Step 3: Review Freeze-Frame Data

Record the conditions under which P0319 was stored:

Vehicle speed
Engine RPM
Engine load
Battery voltage
Individual wheel speeds
Brake-switch status
ABS activity
Stability-control activity
Sensor A value
Sensor B value
Road-surface status where available

Determine whether the code occurred:

During startup
At highway speed
During braking
During a turn
Over an uneven surface
Immediately after repair
During a low-voltage event

Step 4: Identify Sensor B

Use the correct service information to determine:

Whether Sensor B is physical or calculated
Sensor location
Sensor orientation
Supplying module
Connector pinout
Wiring route
Expected signal type
Relationship with Sensor A
Initialization requirements

Possible signal types include:

Analog voltage
Frequency
Pulse-width signal
Digital output
CAN network message
Calculated rough-road status

Do not assume that P0319 uses the same diagnostic procedure on every vehicle.

Comparing Sensor A and Sensor B

Step 5: Monitor Both Sensors Simultaneously

If scan data is available, graph Sensor A and Sensor B together.

Compare their behavior while the vehicle is:

Stationary
Idling
Driving smoothly
Accelerating gently
Braking
Turning
Crossing a controlled uneven surface where safe

Depending on design, healthy signals may:

Rise and fall together
Respond in opposite directions
Operate within a calibrated offset
Show different amplitudes
Activate only during certain conditions

Use manufacturer specifications to judge correlation.

Watch for Sensor B:

Remaining fixed
Dropping to zero
Jumping to maximum
Responding in the wrong direction
Producing excessive noise
Lagging significantly
Disagreeing with Sensor A

Step 6: Determine Whether the Fault Is Shared or Isolated

An isolated Sensor B fault is more likely when:

P0319 is the only rough-road code.
Sensor A behaves normally.
Sensor B power and signal differ.
A dedicated Sensor B circuit is damaged.
Moving Sensor B’s harness reproduces the failure.

A shared-system fault is more likely when:

P0318 and P0319 appear together.
Both sensor values disappear.
Both sensors share power or ground.
The supplying module stops communicating.
Several chassis sensors report faults.
Low-voltage codes are present.

This distinction prevents the replacement of Sensor B when the actual problem is a shared five-volt supply or module ground.

Diagnosing a Physical Sensor B

Step 7: Inspect Sensor B Mounting

If Sensor B is a dedicated accelerometer or chassis sensor, inspect:

Correct mounting position
Correct orientation
Tight fasteners
Correct bracket
Physical damage
Connector engagement
Water intrusion
Corrosion
Collision damage
Non-factory insulation or mounting material

Acceleration sensors depend on rigid, correctly oriented mounting.

A sensor attached loosely or installed backward may be electrically functional while reporting physically incorrect movement.

Step 8: Check Sensor B Power and Ground

Using the wiring diagram, verify:

Supply or reference voltage
Ground integrity
Signal circuit
Shielding where equipped

Use voltage-drop testing for grounds whenever possible.

If Sensor A and Sensor B share power or ground, compare both circuits at the same time.

Normal Sensor A power with abnormal Sensor B power points toward an isolated branch-circuit fault.

Step 9: Test the Sensor B Signal

Follow the manufacturer’s test procedure for the sensor type.

Testing may include:

Measuring resting voltage
Monitoring response to controlled movement
Checking frequency
Checking pulse width
Viewing an oscilloscope waveform
Comparing scan data with physical movement

Watch for:

Signal fixed near zero
Signal fixed near supply voltage
Intermittent dropout
Excessive electrical noise
No response to movement
Output inconsistent with Sensor A

Do not strike, shake or rotate the sensor unless the service procedure specifically permits it.

Diagnosing ABS-Derived Sensor B Data

Step 10: Verify ABS Module Communication

Attempt direct scan-tool communication with the ABS or Electronic Brake Control Module.

If communication fails, inspect:

ABS fuses
Module power supplies
Module grounds
CAN high circuit
CAN low circuit
Connectors
Water intrusion
Module condition

Do not replace the ABS module before confirming power, ground and network integrity.

Step 11: Compare Individual Wheel Speeds

Monitor all wheel-speed values while driving slowly and safely.

Look for:

One wheel remaining at zero
Intermittent dropouts
Implausible spikes
Speed disagreement
Signal loss while turning
Signal changes over bumps
One wheel responding later than the others

If Sensor B is calculated from a particular group of wheel-speed inputs, a failure in one of those signals may trigger P0319.

Step 12: Inspect the Suspect Wheel-Speed Circuit

Inspect:

Sensor mounting
Sensor air gap
Connector
Harness routing
Chafed insulation
Corrosion
Water intrusion
Physical damage
Supply voltage
Ground
Signal waveform

Use the correct procedure for active or passive sensor designs.

Step 13: Inspect the Tone Ring or Magnetic Encoder

Check for:

Cracked tone ring
Missing teeth
Rust expansion
Metal debris
Damaged magnetic encoder
Excessive bearing play
Incorrect replacement bearing
Bearing installed backward
Sensor contact with the encoder

A wheel bearing can rotate perfectly while supplying a completely useless wheel-speed signal. Mechanical happiness and electronic happiness are not always on speaking terms.

Diagnosing Wiring, Communication and Configuration

Step 14: Inspect the Sensor B Circuit

Check for:

Open circuit
Short to ground
Short to voltage
High resistance
Loose terminal tension
Corroded connector pins
Water intrusion
Heat damage
Collision damage
Poor previous repairs

Move the harness while monitoring Sensor B data or waveform output.

An intermittent fault that appears during bumps may be caused by wiring movement rather than the road sensor itself.

Step 15: Inspect Shared Circuits

If P0318 and P0319 appear together, identify shared:

Power supply
Reference voltage
Ground
Connector
Harness section
Supplying module
Network circuit

A shared circuit fault should be repaired before either sensor is condemned.

Step 16: Test Network Communication

If Sensor B information is transmitted through CAN, inspect:

U-codes
Missing modules
CAN high and low voltage
Network resistance where appropriate
Shorted communication circuits
Connector intermittency
Water-damaged modules
Aftermarket wiring attached to the network

An oscilloscope may be required to identify intermittent communication distortion.

Never apply battery voltage or an incandescent test light to a CAN signal circuit.

Step 17: Verify Module Programming

After PCM, ABS, suspension or chassis-module replacement, confirm:

Correct part number
Correct VIN
Correct software calibration
Correct drivetrain configuration
Correct ABS and stability-control options
Correct suspension options
Correct tire-size settings
Correct Sensor A/B assignment
Required programming completed

A used control module may contain configuration data from another vehicle.

It may communicate normally while waiting for a Sensor B that your vehicle has never owned.

Step 18: Complete Required Calibration

Depending on the system, repairs may require:

Sensor B initialization
Sensor A/B correlation calibration
Accelerometer calibration
Yaw-rate sensor calibration
Steering-angle calibration
Suspension-height calibration
ABS module setup
Tire-size programming
PCM setup

Follow the manufacturer’s procedure exactly.

Calibration should occur only after electrical, sensor and communication faults have been repaired.

Step 19: Verify Crankshaft Monitoring

Because Sensor B supports misfire validation, inspect the crankshaft system if related codes are present.

Check:

Crankshaft position sensor
Sensor wiring
Signal waveform
Reluctor wheel
Crankshaft variation status

Related resources include:

Do not replace the crankshaft sensor solely because P0319 is stored.

Step 20: Determine Whether an Actual Misfire Exists

If P0319 appears with P0300 or a cylinder-specific code, review:

Individual-cylinder misfire counters
Mode $06 data
Fuel trims
Ignition operation
Injector operation
Compression
Engine idle quality

A genuine misfire that occurs consistently on smooth roads requires normal combustion diagnosis.

Misfire counts appearing only during rough-road events may indicate invalid Sensor B information.

Step 21: Clear P0319 and Verify the Repair

After correcting the confirmed fault:

Clear PCM and chassis-module codes.
Complete required programming or calibration.
Verify communication with all modules.
Graph Sensor A and Sensor B data.
Confirm valid wheel-speed signals.
Drive on a smooth road.
Cross a controlled uneven surface when safe.
Monitor misfire counters.
Complete the required drive cycle.
Rescan every module.

The repair is confirmed when Sensor B responds correctly and P0319 does not return.

Common P0319 Repairs and Costs

Repair	Approximate installed cost
Repair Sensor B connector or wiring	$100–$600
Replace dedicated Sensor B	$200–$900
Replace wheel-speed sensor	$150–$500
Replace wheel bearing or encoder hub	$300–$900
Complete Sensor A/B calibration	$100–$500
Repair shared power or ground	$150–$800
Repair CAN communication wiring	$200–$1,500+
Program PCM or chassis module	$150–$700
Replace ABS or chassis-control module	$800–$2,500+

Actual costs depend on the vehicle, system design, component access and labor rate.

P0319 may require only a wiring repair, configuration correction or calibration rather than a replacement sensor.

Common P0319 Diagnostic Mistakes

Assuming Sensor B Is on the Right Side

Sensor B is a manufacturer-assigned signal, not a universal physical location.

Copying the P0318 Diagnostic Procedure Blindly

Sensor A and Sensor B may use different circuits, locations or data sources.

Ignoring Sensor A/B Correlation

Comparing both signals can quickly separate an isolated Sensor B fault from a shared-system failure.

Replacing Sensor B When Both Codes Are Present

P0318 and P0319 together often point toward shared power, ground, communication or module problems.

Ignoring Sensor Orientation

An incorrectly mounted accelerometer can produce plausible-looking but incorrect data.

Replacing a Wheel-Speed Sensor Without Checking ABS Data

Confirm the missing or erratic wheel-speed signal before replacing parts.

Ignoring Module Programming

Replacement controllers may require correct option configuration and Sensor B assignment.

Treating P0319 as an Engine Misfire

P0319 concerns rough-road information used during misfire validation. It does not prove combustion failure.

Clearing Only the PCM

Related codes may remain stored in ABS, stability, suspension or chassis modules.

P0319 Frequently Asked Questions

What does P0319 mean?

P0319 means the PCM detected a fault involving its designated Rough Road Sensor B signal.

What is Rough Road Sensor B?

It is a manufacturer-defined rough-road data source. It may be a dedicated sensor, second acceleration channel, ABS calculation or network message.

Is Sensor B the right-side wheel-speed sensor?

Not necessarily. Use manufacturer service information to identify Sensor B.

What is the difference between P0318 and P0319?

P0318 applies to Sensor A. P0319 applies to Sensor B.

What does it mean if P0318 and P0319 appear together?

A shared power, ground, module, network, configuration or calibration problem becomes more likely.

Can an ABS sensor cause P0319?

Yes, if the vehicle uses wheel-speed data to calculate the Sensor B rough-road signal.

Can a wheel bearing cause P0319?

Yes. A damaged or incorrectly installed encoder can disrupt wheel-speed information.

Does P0319 mean the engine is misfiring?

No. It means the Sensor B information used to validate misfire data is faulty.

Can PCM programming cause P0319?

Yes. Incorrect configuration can make the PCM expect the wrong Sensor B input.

Can suspension work cause P0319?

Yes. Suspension or collision repairs may disturb sensor mounting, orientation, wiring or calibration.

Can I drive with P0319?

Usually for a short distance if braking, ABS, stability control and engine operation remain normal. Drive cautiously and diagnose the fault promptly.

Will P0319 clear itself?

An intermittent fault may become historical if the signal returns, but the code may remain stored until cleared or enough successful drive cycles occur.

Related OBD-II Codes

P0317 — Rough Road Hardware Not Present
P0318 — Rough Road Sensor A Signal Circuit
P0319 — Rough Road Sensor B Signal Circuit
P0315 — Crankshaft Position Variation Not Learned
P0335 — Crankshaft Position Sensor A Circuit
P0300 — Random or Multiple-Cylinder Misfire
C0035–C0051 — Wheel-Speed Sensor Codes
U-codes — Module Communication Faults

Explore the Pro Street OBD-II Code Libraries

Use the Pro Street cornerstone pages to find additional diagnostic trouble codes:

P0319 means the PCM detected an invalid, missing or implausible Rough Road Sensor B signal.

Begin by identifying what Sensor B represents on the vehicle. Compare Sensor A and Sensor B data, inspect dedicated circuits and shared supplies, verify ABS-derived wheel-speed information, and check network communication.

If the code appeared after module, suspension or collision repair, verify configuration, sensor orientation and calibration before replacing components.

Sensor B is not automatically on the right, Sensor A is not automatically on the left, and neither one cares what the alphabet usually implies. Factory diagrams remain annoyingly useful.

P0319 Code: Rough Road Sensor “B” Signal Circuit